E/ECE/324/Rev.2/Add.109/Rev.
5
E/ECE/TRANS/505/Rev.2/Add.109/Rev.5
Annex 4D
(g) At the completion of all tests indicated in subparagraphs (a), (b), (c),
(d), (e) and (f), the regulator shall be leak proof (see Annex 5B) at the
temperatures of -40 °C or -20 °C, as applicable, and at the room
temperature and at the temperature of +120 °C.
3. Classification and test pressures
3.1. The part of the pressure regulator which is in contact with the pressure of the
container is regarded as Class 0.
3.1.1. The Class 0 part of the pressure regulator shall be leak-proof (see Annex 5B)
at a pressure up to 1.5 times the working pressure (MPa) with the outlet(s) of
that part closed off.
3.1.2. The Class 0 part of the pressure regulator shall withstand a pressure up to
1.5 times the working pressure (MPa).
3.1.3. The Class 1 and Class 2 part of the CNG pressure regulator shall be
leak-proof (see Annex 5B) at a pressure up to twice the working pressure.
3.1.4. The Class 1 and Class 2 part of the CNG pressure regulator shall withstand a
pressure up to twice the working pressure.
3.1.5. The Class 3 part of the CNG pressure regulator shall withstand a pressure up
to twice the relief pressure of the pressure relief valve, on which it is subject.
3.2. The part of the pressure regulator which is in contact with pressure higher
than 26 MPa is regarded as Class 6.
3.2.1. The Class 6 part of the pressure regulator shall be leak-proof (see Annex 5B)
at a pressure up to 1.5 times the working pressure (MPa) with the outlet(s) of
that part closed off.
3.2.2. The Class 6 part of the pressure regulator shall withstand a pressure up to 1.5
times the working pressure (MPa).
3.2.3. The part of the pressure regulator that is in contact with pressure below 26
MPa is classified as per Part I, Section 3, of this Regulation.
3.2.3.1. The Class 0 part of the pressure regulator shall be leak-proof (see Annex 5B)
at a pressure up to 1.5 times the working pressure (MPa) with the outlet(s) of
that part closed off.
3.2.3.2. The Class 0 part of the pressure regulator shall withstand a pressure up to 1.5
times the working pressure (MPa).
3.2.3.3. The Class 1 and Class 2 part of the CNG pressure regulator shall be leak-
proof (see Annex 5B) at a pressure up to twice the working pressure.
3.2.3.4. The Class 1 and Class 2 part of the CNG pressure regulator shall withstand a
pressure up to twice the working pressure.
3.2.3.5. The Class 3 part of the CNG pressure regulator shall withstand a pressure up
to twice the relief pressure of the pressure relief valve, on which it is subject.
3.3. The pressure regulator shall be so designed to operate at temperatures as
specified in Annex 5O.
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